Valve device for hydraulic jacks.



D. E. HENNESSY.

.VALVE DEVICE FOR HYDRAULIC JACKS.

APPLICATION FILED .IULY I9. I9I3 Patented July 4, 1916.

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ideama@ v DANIEL n. HENnnssY, or nonronnjirassaonusnrrs, assreivon, BYMESNE ASSIGN- Mnn'rs, To HERBERT wcowan, J. enivre wrcnorr, ann EDWARDN. WHITE,

ventinay :envien non, HYDRAULIC lMens.

ToaZZ 'whom z't may concern.'

Bel it known that I, DANIEL E. HENNEssr, a citizen of the UnitedSta-tes, residing at Holyoke, Massachusetts, have invented cer tain newanduseful Improvements in Valve Devices for Hydraulic Jacks, of whichthe following is a clear, full, and exact descripn tion. Y

This invention relates to animprovement in hydraulic jacks, and has forits'object the improvement of the same both as regards eliiciency' inoperationand economy of construction.

In the preferred embodiment of my invention shown in the drawings,Figure 1 is a longitudinal section of such a jack, a portion of theloperating handle and ram being cut away; Fig. 2 is a cross sectionthrough line. 2-2 of Fig. 1; Fig. 3 is an end view looking from the leftof Fig. 1; and Fig. 4 is a detail longitudinal section showing amodification.

Referring moreparticularly to the drawings., a cylindrical shell 1preferably made of one integral piece has formed therein a pump chamber3 and ram chamber 2, prei-y erably arranged in tandem. A pump piston 5is adapted to work back and forth in the pump chamber, and a ram 40 isadapted to work in the ram chamber 2. Preferably concentric with theshell 1 is formed an annular reservoir chamber 27 having outer wall 6,and it is understood that this reservoir chamber is adaptedto containthe iuid for operating. the jack whether it be air, water or any othersimilar means.

The pump piston 5 may be operated back and forth by any suitable leverarrangement, 1

part of which is shown by lever 26 pivoted at 7 on bracket 12, andconnected at 8- to the end 9 of said piston 5. rlhe piston 5 is alsopreferably formed with a shoulder 10 for limiting its inward travel,either by abutting against the end -of the shell 1 or against a stop 11as shown in Figs. 1 and 3. justable stop 11 in the present embodimentconsists merely of a pivoted latch, which in its vertical position asshown in Fig. 1 is adapted to stop the inward travel of the pump pistonbefore shoulder 10 reaches the shell l buty which in its horizontalposition shown by dotted linesv in Fig. 3 allows said ,i gpeyziiioatilmvpfLetters JPatent. Application tiled July 19, 1913. Serial No. 779,903.y

Patented July 4, 1916..

pump piston 5 to move farther on into the pumping chamber for a purposeto be presently described.

Communicaton between the pumping chamber 3 andreservoir 27 is effectedvthrough port 19 and communication between pumping chamber and the ramchamber 2 is..

eifected through port 13. Puppet valves 20 and 4 are arranged to beseated upon the `ports 19 and 13 respectively.

` in the present embodiment the preferable arrangement and constructionof the puppet valves and their ports are as follows. Intermediatebetween the pumping chamber 3 and ram chamber 2 is arranged a bodymember 29 having cylindrical portions, oney for i fitting the inside ofchamber 3 and one for fitting the inside of chamber 2. This intermediatebody member 29 may be of one integral piece and preferably serves as acommon cylinder headfor both chambers 2 and 3. As seen the ports 19 and13 are formed in this body member29 and valve 4 has a stem 15 passingthrough said body member. At the pumping chamber side of the body member29 is preferably formed a lever supporting portion 25,which also may bein.- tegral with said body member, and this supporting portion 25 asshown in Fig. '2 provides va guiding support for the stem 21 of valve 20andthe stem 15 of valve 4. A coil spring 22 surrounding valve stem 21tends to seat the valve 20 in one direction, and a coil spring 16surrounding stem 15 tends to seat the valve 4 inthe opposite direction.Loosely mounted upon the support 25 is a lever or movable device 23having a projecting boss 24 serving as a fulcrum therefor, which lever23 engages-beneath head y18 of valve stem 15. and head 30 of valve 21.

ln Fig. 4 a modification of the device is' In the embodiment of theinvention shown in Fig. 3 and the pump piston 5 is thrust farther intoits chamber so that the end of the same comes into positive enga-gementwith the head 18 of valve stem 15 to open said valve 4'4 against itsspring. At the same time lever 23 is rocked to move valve stem 21, 30,in the opposite direction and open valve 20. In

this way both Valves areoperated by the inward movement of the pumppiston so asv to be open at the same time, and communication is openedfrom `thel ram chamber 2 through pump chamber-.3, to reservoir 27,whereby thed uid flows back immediately and allows the load to lower.

In the embodiment of my invention shown in Fig. 1 the ram may bereleased by an adjustment of the separate latch-piece 11 and theoperation of the piston as described, but

in Fig. 4 a modification is shown in which no separate latch-piece-isrequired and the ram may be released at anytime by a continuous inwardmovement of the pump piston. To provide against releasing the ram attimes when it is not desired, that is during the normal operation of thepump, a warning is given to the operator which will enable him to stopmoving the piston inwardly too far. This warning is accomplished byopening the valve 20 prior to the opening of valve 4, whereby the inwardmovement of piston 5 causes first a slight release of pressure in frontof the piston before the valve leading to the ram chamber has beenopened. This preliminary release of pressure gives the operator warningthat he has moved the piston 5 too far inwardly and that if he doesntwish to release his ram he must immediately stop the Jfurther movementof his piston or move it in the other direction'. 'The opening of valve20 before the opening of valve 4 is accomplished in the presentembodiment by providing lost motion between the end of the piston 5 andhead 1 8 of valve stem 15. As shown, the lever piece 23a is providedwith an extension 28 above said head 18, whereby the piston 5 initsinward movement engages first-extension 28 to rock lever`23a and openvalve 20, and later lbrings said extension into conta-ct with head 18 toopen valve 4. i

It is to be understood that the embodiment of my invention hereinshownand described 1s merely one practlcal construction of the same, and thatequlvalent varlatlons may be a separate valve for each port movable inopposite directions for beingopened, manuall operated means for openingbothl offsaid valves together forgiving communication between said ramchamber and said 'reservoir, comprising a rocking member lfortransv`mitting movement to one of said valves in a reverse direction tothat ofthe? other valve.

2. In a hydraulic jack in combination, a pumping chamber having a pistontherein, inlet. andv outlet ports at 'one end of said pumping chamberopposite the endl of said piston, a separate valve for each port locateddirectly in front of saidpiston, and means for opening both ofsaidvalves by a positive engagement with said pump piston when the same ismoved in one direction.

3. In a hydraulic jack in combination, a pumping chamber having a pistontherein, inlet and outlet `ports at one end 'of said pumping chamberopposite the vend of said piston, a separate valve foreach port, andmeans for opening both of said valves together by a positive engagementwith the inner end of said pump piston.

4. In a hydraulic jack/in combination, a pumping chamber having a pistontherein, inlet and outlet ports at one end of said pumping chamberopposite the end of said piston, a separate valve for each port, andmeans for opening both of said valves by a v positive engagement withsaid pump piston when the same is moved in one direction, comprising arocking member acting to transmit movement to one of said valves in areverse Vdirection to that of the other Valve.

5. In a hydraulic jack in combination, a.

pumping chamber and a ram chamber arranged in tandem, said pumpingchamber Ihaving a piston adapted to work therein,

for opening both of saidvalves bya positive engagement with said pumpingpiston when the same is moved in one direction.

6. A hydraulic jack having a valve device removably mounted therein,comprising a bodyy member with two separate ports menait for closingsaid ports, stems on said valves slidably 'mountedon said bod member, alever support and a lever roc ing on said `support and engaging saidvalve stems for transmitting movement to one of said valves i in areverse direction to that of thel other valve.

8. ln a hydraulic jack in combination, an integral cylindrical shellhaving a pumping chamber anda ram chamber arranged in tandem, aremovable intermediate body member serving as a common cylinder head forboth said umpingand ram chambers, inlet and out et ports for saidpumping chamber, separate valves 'for said ports, and means for openingboth of said valves to.- gether by said piston when the same is moved inone direction. s

9. In a hydraulic jack in combination, an

"integral cylindrical shell having a pumping chamber and a ram chamberarranged in tandem, a removable intermediate body member Serving as acommon cylinder head for both said umping and ram chambers, inlet andout et ports for said pumping chamber formed in said body member,separate valves for said ports, and means for. opening both of saidvalves together by the inner end of Said piston.

l0. A hydraulic jack having in combination, a reservoir chamber, apumping chamber, a ram chamber, a Acommunicating port between saidreservoir and said pumping chamber, a communicating port between saidpumping chamber and said ram chamber, a Working fluid confined in saidjack, a pump piston working in said pumping chamber, valves for saidports arranged to be opened alternately by the normal pump,- ing actionof said pump piston to transfer fluid from said reservoir to said ramchamber and an independently movable device adapted when operated toopen both of said valves so that said valves will be open at the sametime in order to allow fluid to flow back from said ram chamber to saidreser- VOlI'.

11. A hydraulic jack having in combination, a reservoir chamber, apumping chamber, a ram chamber, a communicating portbetween saidreservoir and said pumping chamber, a communlcatmg port between saidpumping chamber and sald ram chamber, la

.pump piston working in said pumping chamber, valves for said portsarranged to t1on, a reservoir chamber,

be openedalternately by the normal pump-l .ing action of said pumppiston to transfer Huid from said reservoiry to said ram cham# Yber anda movable device connected with both of said valves adapted whenoperated to open both of said valves so that said valves will be open atthe same time in order to allow Huid to ow back from said ram chamber.

12. A hydraulic jack having in combination,a reservoir chamber, apumping chamber, a ram chamber, a communicating port between saidreservoir and said pumping chamber, a communicating port between pumppiston working in said pumping chamber, valves for said ports arrangedto be opened ing action Huid from said reservoir to said ram chamber andan independently movable device adapted When operated to open both ofsaid valves so that said valves will be open at the same time in orderto allow fluid to lllow back from said ram chamber to said reservoir andmanuali controlled means for operating said Inova le device to releasesaid ram.

13.y A hydraulic jack having in combinaa ram chamber, and a pumpingchamber, an inlet port from said reservoir to said pumping chamber, anoutlet port from said pumping chamber to said ram chamber, a workingHuid conlinedA in said jack, a pump piston working in said pumpingchamber, an inlet valve and an outlet valve for said respective portsarranged to be opened alternately in pumping huid from said reservoir tosaid ram chamber 'and means operated by the inward movement of saidpiston beyond its normal expelling stroke to open both of said valves sothat said valves will both be open at the same time to allow iuid toflow back from said ram chamber to said reservoir, said means beingconstructed and arranged to open said inlet valve slightly in advance ofsaid outlet valve.

14. A hydraulic jack having, in combination, a reservoir chamber, apumping chamber, a ram chamber, communicating ports respectively betweensaid reservoir and pumping chambers and between said pumping and ramchambers, a pump piston working in said pumping chamber, valves for saidports, and valve opening means separate from the piston but arranged tobe engaged and operated thereby and constructed to open both of saidvalves in a predeterf mined order.

15. A hydraulic jack having, in combination, a reservoir chamber, apumping cham- 'said pumping chamberY and said ram chamber, a workingfluid confined in said jack, a`

alternately by the normal pumpy of said pump piston lto transferl ber, aram chamber, communicating ports respectively between said 'reservoirand pumping chambers and between said pumping and ram chambers, a pumppiston Working in said pumping chamber, Val-ves for said ports, andvalve opening means sepap rate from the piston but arranged to be'engaged and operated thereby and con- Istructed tgmcpen the Valvebetween the res-

